Beatrice McCartney (Born: October 28, 2003) Unlike her older siblings, Beatrice McCartney is the daughter of Paul and his second wife, ex Heather Mills. The adorable teen might not have a distinguished career or kids, but she once did learn how to play the saxophone! While Beatrice still has time to figure out her career path, she did once admit to maybe wanting to become a marine biologist. So cool!